<template>
	<view v-if="visibleSync" class="uni-drawer" @touchmove.stop.prevent="moveHandle" :class="{'uni-drawer--visible':showDrawer,'uni-drawer--right':rightMode}">
		<view class="uni-drawer__mask" @tap="close"></view>
		<view class="uni-drawer__content">
			<slot></slot>
		</view>
	</view>
</template>

<script>
export default {
	name: 'uni-drawer',
	props: {
		/**
			 * 显示状态
			 */
		visible: {
			type: Boolean,
			default: false
		},
		/**
			 * 显示模式（左、右），只在初始化生效
			 */
		mode: String,
		/**
			 * 蒙层显示状态
			 */
		mask: {
			type: [Boolean, String],
			default: true
		}
	},
	data() {
		return {
			visibleSync: false,
			showDrawer: false,
			rightMode: false,
			closeTimer: null,
			watchTimer: null
		}
	},
	watch: {
		visible(val) {
			clearTimeout(this.watchTimer)
			setTimeout(() => {
				this.showDrawer = val
			}, 100)
			if (this.visibleSync) {
				clearTimeout(this.closeTimer)
			}
			if (val) {
				this.visibleSync = val
			} else {
				this.watchTimer = setTimeout(() => {
					this.visibleSync = val
				}, 300)
			}
		}
	},
	computed: {
		showMask() {
			return String(this.mask) === 'true'
		}
	},
	created() {
		this.visibleSync = this.visible
		setTimeout(() => {
			this.showDrawer = this.visible
		}, 100)
		this.rightMode = this.mode === 'right'
	},
	methods: {
		close() {
			this.showDrawer = false
			this.$emit('close')
			this.closeTimer = setTimeout(() => {
				this.visibleSync = false
			}, 200)
		},
		moveHandle() {}
	}
}
</script>

<style lang="scss">
	$drawer-width:78.8%;

	.uni-drawer {
		display: block;
		position: fixed;
		top: 0;
		left: 0;
		right: 0;
		bottom: 0;
		overflow: hidden;
		visibility: hidden;
		z-index: 998;
		height: 100%;

		&.uni-drawer--right {
			.uni-drawer__content {
				left: auto;
				right: 0;
				transform: translatex(100%);
			}
		}

		&.uni-drawer--visible {
			visibility: visible;

			.uni-drawer__content {
				transform: translatex(0);
			}

			.uni-drawer__mask {
				display: block;
				opacity: 1;
			}
		}

		&__mask {
			display: block;
			opacity: 0;
			position: absolute;
			top: 0;
			left: 0;
			width: 100%;
			height: 100%;
			background: $uni-bg-color-mask;
			transition: opacity 0.3s;
		}

		&__content {
			display: block;
			position: absolute;
			top: 0;
			left: 0;
			width: $drawer-width;
			height: 100%;
			background: $uni-bg-color;
			transition: all 0.3s ease-out;
			transform: translatex(-100%);
		}
	}
</style>
